Please refer to Revision history for the complete list of changes (it's short, but all items are really important). You can download it here.
Note: we decreased help topic limit to 100 for Express Edition.
Its pages on our web site aren't updated yet (will be done next week), so there are no "Buy upgrade" links. But its User Guide is already updated, and all "Buy now" links are correct there.
P.S. I published first relatively big post @ blog.dataobjects.net.